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Thermal energy (heat) meter BACnet module · BACnet points list

Siemens WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters BACnet points list

Updated 6 November 2026

Short answer

The WZU-485E-BAC plugs into slot 1 of a UH50 or UC50 ultrasonic heat meter and serves its data on BACnet MS/TP. It has 12 read-only Analog Inputs: serial number, energy and tariff registers, volume, flow, power, an info (error) code and the hot, cold and differential temperatures. The module needs its own 24 V supply.

This page lists 12 BACnet objects for the Siemens WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters — 0 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Siemens’s own free documentation, linked below.

Manufacturer
Siemens
Model
WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters
Equipment
Thermal energy (heat) meter BACnet module
Equipment type
Thermostats, sensors & meters
BACnet objects
12 (0 writable)
Transport
BACnet MS/TP
Firmware
Meter firmware 5.15 or later
Default device instance
Last 6 digits of the meter serial number
Also known as
WZU-485E-BAC, UH50, UC50, UH50-RS485, Ultraheat UH50 BACnet, T550
Source document
Operating instructions BACnet module WZU-485E-BAC · A6V12318605_----_a · rev. 2021-01-28
Download CSV 12 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Compare with your scan Download Easy BACnet Mobile App Google Play

Reference only, provided as-is: verify against Siemens’s current documentation and the live device before use. Not official Siemens information. Terms of use.

BMS integration notes: Siemens WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters

Integration in brief

Fit the module in slot 1, power it from a separate 24 V supply, set the MAC address (on the meter for module firmware v1-v4, or with the WZU-485 Configuration Tool for v5+) and baud, then read energy, power, flow, temperatures and the info code.

Minimum points to map

The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.

ObjectNameWhyAccess
AI 1EnergyEnergy total, unit as meter displayRead
AI 5Current powerThermal power, kWRead
AI 4Current flow rateFlow rate, m3/hRead
AI 3VolumeAccumulated volume, m3Read
AI 9Temperature hot sideHot side temperature, °CRead
AI 10Temperature cold sideCold side temperature, °CRead
AI 8Info codeError code, 0 = no errorRead

Network setup

Watch out for

Siemens WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters BACnet objects

Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.

Note: the source document has no read/write column, so access here is inferred from the object type (inputs read-only, values writable). Confirm on the live controller before writing.

12 of 12 shown
Type
Analog
Show
Siemens WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters BACnet Points List
DescriptionStates
AI0Serial numberMeter serial numberRead
AImin1EnergyStandard energy register: heat (heat/combined meter) or cooling (cooling meter)kWh, MWh, MJ or GJ (as meter display)Read
AI2Tariff 1 cooling if comb. meterTariff register 1; cooling energy on combined meterskWh or MWh (as meter display)Read
AImin3VolumeAccumulated volumem3Read
AImin4Current flow rateCurrent flow ratem3/hRead
AImin5Current powerCurrent thermal powerkWRead
AI6Tariff 2 OR: Pulse input 1 accumulatedTariff register 2, or pulse input 1 volume if enabledas meter display, or m3Read
AI7Tariff 3 OR: Pulse input 2 accumulatedTariff register 3, or pulse input 2 volume if enabledas meter display, or m3Read
AImin8Info codeError code: 0 none, 3 internal, 5 flow, 6-9 temperature sensorsRead0=No error, 3=Internal errors (F3, F4, F7, F8, F9), 5=Flow rate error (F0, F9, F4), 6=Hot side sensor open (F1), 7=Hot side sensor short (F5), 8=Cold side sensor open (F2), 9=Cold side sensor short (F6)
AImin9Temperature hot sideHot side temperature (combined meter in heat mode)°CRead
AImin10Temperature cold sideCold side temperature (combined meter in heat mode)°CRead
AI11Differential temperatureHot minus cold temperatureKRead
Object ID lookup: Siemens WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters point IDs by name

Integration notes

Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.

Questions about the Siemens WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters

How many BACnet points does the Siemens WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters have?

This list has 12 BACnet objects: 12 analog inputs. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Siemens WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters BACnet points are writable?

None of the listed objects are marked writable in the source documentation. The source has no read/write column, so this is inferred from object type.

Where is the official Siemens WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters BACnet documentation?

The source is Operating instructions BACnet module WZU-485E-BAC (A6V12318605_----_a), revision 2021-01-28, published free by Siemens at https://sid.siemens.com/api/khub/documents/dCTyTp0PFeIeWmT_DFvUdA/content.

What are the minimum BACnet points to integrate the Siemens WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters?

Start with AI 1 Energy (Energy total, unit as meter display); AI 5 Current power (Thermal power, kW); AI 4 Current flow rate (Flow rate, m3/h); AI 3 Volume (Accumulated volume, m3); AI 9 Temperature hot side (Hot side temperature, °C); AI 10 Temperature cold side (Cold side temperature, °C); AI 8 Info code (Error code, 0 = no error).

How do I check these points on the real WZU-485E-BAC BACnet MS/TP module for UH50 / UC50 ultrasonic heat meters?

Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.

More Siemens BACnet points lists

Source: Operating instructions BACnet module WZU-485E-BAC · A6V12318605_----_a · rev. 2021-01-28. Object names, instances and units are reproduced as published; descriptions are our own.